Didn't mean it to be cryptic. Sorry.
But just think about it - notation, theory, composition, those are all "tools" geared towards steering the creative impulse into a certain "means of expression". Doesn't mean it's "bad" or anything. but why do you need theory except as a reference point as to how things are "supposed" to sound? Why do you need notation except as a means to ensure that a certain idea gets reproduced past the moment of inspiration? Why do you need composition except as a means to create an structure of order and then preserve it? (And why preserve it? Plenty of answers to that one, some benign, some not).
Again, those are all useful tools. But tools they nevertheless are. And tools are used to build. And where there's building, eventually there's zoning. And when there's zoning, the nature/impulse of the building process can't help but change, especially as the years pass and things get old and crowded. You're not building for the sake/joy of building anymore, you're looking to build something that will pass spec. And damn do those tools come in handy for that! So handy that you can buy hammers and shit at freakin' grocery stores and 7-11s now.
It's taken centuries for us to get to this point, but here we are. It's inevitable, and it's nothing to get freaked about, I don't think. As one cycle ends, another begins, and the overlap will probably be a lengthy one, and may never completely disappear. But it's probably time to consider the notion that the old buildings are going to crumble and fall, and that maybe people aren't going to want or need buildings anymore. Or if they do, not the same type buidings with the same functions as the old ones. Sense of place is by no means a fixed quantity, doncha' know, and what are buildings except firm declarations of fixed space?
That's probably cryptic too, and again, sorry 'bout that. But think about it anyways, ok?